Assets not loading - kind of

Hi, I set up Kanboard yesterday, but I seem to misconfigured something because none of the assets (CSS/JS/images) are loading.

And by loading I mean get processed/displayed on the screen because as seen below, they are accessible through the web server.
No errors serverside or clientside, I really don’t know where to go with this.
Can someone lighten me up?

I’m using OpenBSD/PHP 7.3 (through PHP-FPM)/nginx/Sqlite
nginx config: server { listen 443; root /var/www/devroot; ssl on; ssl_cert -

Nevermind, I figured it out.
For some reason nginx sent all the files with the ‘text/plain’ MIME, which caused them to be discarded or something.
‘include mime.types;’ in the config fixed it.